Boiler for movable steam-power plants



Aug. 16, 1927.

O. H. HARTMANN BOILER FOR MOVABLE STEAM POWER PLANTS Filed March '23, 1925 W/rn/Ess A TTOR/VEVS Patented Aug. 16, 1927.

UNITED STATES PATENT OFFICE.

OTTO H. HARTMANN, OF OASSEL-WILHELMSHOHE, GERMANY, ASSIGNOR '1'0 SCHMIDTSCHE HEISSDAMPF-GESELLSCHAFT M. B. 11., O1 OASSEL-WIL- HELMSHOHE, GERMANY, A CORPORATION OF GERMANY.

BOILER FOR MOVABLE STEAM-POWER PLANTS.

Application filed March 28, 1825, Serial No. 17,607, and in Germany April 2, 1924.

In locomotive boilers consisting of two parts working at different pressures, of which the high-pressure part is constructed as a fire-box and the low-pressure part'as 5 a smoke-tube longitudinal boiler, only a very difiiculties are overcome by extending the upper drum of the fire-box for a certain distance over the longitudinal boiler, the steam being preferably taken from the extension which thus serves as a steam collector.

This arrangement possesses, inter alia, the advantage that the high-pressure and the low-pressure boilers can be easilv connected together so that the locomotive boiler. comprising two functionally distinct boilers, corresponds closely to the original Stephenson boiler which forms as it were the backbone of the whole locomotive.

In high-speed locomotives of high power in which the longitudinal boiler is considerably raised, there is usually not sufiicient space available above the longitudinal boiler for the upper drum of the fire-box.

In such a case, according to one form of the present invention, the longitudinal boiler is recessed and the extension of the upper drum of the fire-box arranged in this recess.

This construction makes it possible to give the upper drum of the fire-box the same diameter over its entire length and thereb to secure an increase of water space.

In order to prevent priming, strainers,

baflies or similar devioes may be arranged within the extended part ofthe upper d u of the fire-box, such part. being thereby utilized as a separator for the water and steam.

In order to economize weight, the underlying ideaof. the present invention maybe by water tubes, a, which extend upwardly developed as regards the structural connec tion of the two boilers.v For example, the

shell or wall of the high-pressure drum may which steam is taken. and such a boiler-therefore supplies dry steam. This arrangement is of special importance in fire-box boilers which are heated indirectly by means of a heat-carrier (for instance water), the heattransferrer in such a case being preferably arranged about the middle of the length of the upper drum leaving the ends unoccupied.

In this way a water circulation from the middle towards the ends is established, whereby steam bubbles are separated and the supply of dry steam ensured.

e arrangements described above can be modified when desired by the application of two upper drums arranged either on the lon-, gitudinal boiler or in recesses formed there- 1n.

Illustrative for'ns of the invention are shown in the accompanying drawings t Fig.1 shows one form in longitudinal secion,

2 being a cross-section on the line 2-2 of FigJ-I;

Fig. 3 shows a second dinal section, while Fig. 4 shows a similar view of a third form, 1

Fig. 5 being a cross-section on the line 5--5 of Fig. 4, and

6 a similar section of a modification; final y Fig. 7 shows in cross-section a method of structurally connecting the high-pressure and low-pressure boilers.

The fire-box of he locomotive is formed smoke-tube boiler is indicatedby the letter,

d. As above mentioned, the water-tube firebox serving as the high-pressure boiler, can

be provided with one or more upper steamand-water drums.

In the form of the invention shown in.

Figs. 1 and 2, that part of the drum, 0, which extends in a longitudinal direction over the longitudinal boiler is of less crosssectional area than-the remainder.

In the form of the invention shown in Figs. 3 to 7, the drum, 0, has the same diameterthroughout its entire length.

If the longitudinal boiler, as inthe case of high speed engines of large power, is arranged with its centre of gravity at a considerable height, the space available would not be sufiicient for accommodating the projecting part of the drum, 0. As described above, the projecting part may, therefore, have a smaller diameter or, to avoid this, the longitudinal boiler, d, itself at its rear end may have a smaller cross-section than at the other parts of its length. There will thus be a depression or recess at this end of the boiler in which the upper drum can lie as shown in Figs. 3 to 7.

In the form of the invention shown in Fig. 4, the arrangement is such that the shell or wall of the'projecting end of the drum, 0, is common to the high-pressure boiler and to the longitudinal boiler, (l, this arrangement having advantages which have already been explained above.

The forms of the invention shown in cross-section in Figs. 5 and 6 differ only in the fact that in Fig. 5" one drum, and in Fig. 6 two drums,..o, are provided for the high-pressure boiler.

In all the examples shown in Figs. 3 to 7, the drums c, are connected rigidly with the longitudinal boiler in the region where they overlap one another. This connection can be effected in different ways. In Fig. 3, rings or straps, e, are arranged round the drum, 0, and secured in any suitable way to the longitudinal boiler, 01. In Fig. 7 the rigid connection of the parts in question is effected by arranging bearing brackets, f, on

the drum, 0, which are secured to the longi- T tudinal boiler, cl, bolts or in any other suitable manner. As described above, it 1s des1rable to utilise the forwardly-extending end of the drum, c,.of. the high-pressure boiler as a dome and in this space, therefore, arrangements for separating the water and steam 'are preferably provided.

I As an example of an arrangement suitable for this purpose, I have illustrated a screen or perforated battle it in Figs. 1. 3 and 4.

It may also be pointed out that in Fig.

3, the generation of steam inthe water-tube fire b'oxis effected through indirect heating of the water in the drum by means of a heat-carrier circulating in a closed circuit,v

the heat transferrers, g, necessary for this purpose being preferably arranged at about the middle of the length of the drum so that a water circulation is established from this central region to the two ends.

The heat-carrier may be a fluid such as water, which would become heated in the header 1) andchiefly in the watertubes a,

this heat carrier then rising into the heattransferreng which maybe a set of pipes located within the drum 0'. The interior of these pipes does not communicate with the interior of the drum, but only with the tubes (1 and header 6, so that the water forming the heat-carrier or heating medium will circulate through a closedpath which has no communication with the drum 0, but extends through said drum in heat-exchange relation to the water contained in said drum,-to convert this water into steam.

In all the other forms of my invention-illustrated herein, the water-space of the drum 0 communicates with the tubes- (1, so that steam is generated by direct heating, from the body of water contained in the header 6, tubes (1, and drum 0. The indirect heating indicated in Fig. 3 requires two separate bodies of water, one of them circulating through a closed path I); a, g, and the other yielding the steam which is taken from the drums to the place of use.

What I claim is: 1. A boiler formovable steam-plants comprising a high.v pressure portion including afire box having adrum for water and steam, and alow pressure portion arranged as a longitudinal boiler out of communicationwith the high pressureportion, the said. low pressure boiler communicating with the fire box so as to be directly heated by the combustion products thereof, said steam and water drum projecting forwardly beyond the front of the fire box and above therear portionof the longitudinal boiler so as to overlap the same, one of said overlapping parts being of smaller cross section at the overlapping portion than on the remaining portion of said part.

2. A boiler for movable steam plants com- I prising a high pressure portion including a fire-box having a drum for water and steam, and a low pressure portlon arranged as a longitudinal boiler out of communication with'the high pressure portion, the said low pressure boiler communicating with the fire box so as to'be directly heated by the combustion products thereof, said low pressure boiler portion being for a part of its length of smaller cross section than the remaining part, said steam and water drum projecting forv va rdly beyond the front of the fire box 4. In a boiler as claimed in claim 1 above-the smaller portion of the low preswater-9e arating devices arrgn ed in the t rd? g sure boiler portion. forwa y projecting part of the drum. v 3. In a boiler as claimed in claim 1,. a In testimony-whereof I have hereunto set 5 rigid connection for connecting the overlapmy hand.

llillg ends of the drum 'and the low, pressure iv er. v 

